The superuser logo has a square bracket and a curly bracket. is there a keyboard or ascii character for the "eye" dot?
The horizontal spacing is off, and obviously the curly bracket doesn't have the vertical asymmetry of the real icon, but how about the following?
Here's a smaller version, which has better horizontal spacing, assuming you can see it:
However, this is a bit of a cheat as I'm using a unicode dot ( • ) and then making it superscript and italic...
You just need to find the right font ;)